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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4826
PUT
Columbus McKinnon
CMCO
$612M
| $169K | ﹤0.01% |
10,600
+4,400
| +71% | +$74.2K |
2026 Q1
2 quarters
|
|
4827
CALL
W.R. Berkley
WRB
$28.7B
| $169K | ﹤0.01% |
2,500
-600
| -19% | -$42.3K |
2019 Q2
29 quarters
|
|
4828
CALL
Acco Brands
ACCO
$494M
| $169K | ﹤0.01% |
40,200
+40,000
| +20,000% | +$168K |
2026 Q2
1 quarter
|
|
4829
PUT
Brookfield Renewable
BEP
$8.96B
| $169K | ﹤0.01% |
6,000
+800
| +15% | +$25.5K |
2026 Q1
2 quarters
|
|
4830
Brookfield Asset Management
BAM
$82.1B
| $168K | ﹤0.01% |
+3,772
| New | +$184K |
2026 Q3
0 quarters
|
|
4831
PUT
StoneX
SNEX
$6.89B
| $168K | ﹤0.01% |
2,600
+800
| +44% | +$56.8K |
2025 Q4
3 quarters
|
|
4832
CALL
Usana Health Sciences
USNA
$235M
| $168K | ﹤0.01% |
11,600
+11,100
| +2,220% | +$191K |
2025 Q1
6 quarters
|
|
4833
VanEck BDC Income ETF
BIZD
$1.49B
| $168K | ﹤0.01% |
13,019
-39,339
| -75% | -$509K |
2026 Q2
1 quarter
|
|
4834
Innovative Industrial Properties
IIPR
$1.45B
| $168K | ﹤0.01% |
+3,185
| New | +$187K |
2026 Q3
0 quarters
|
|
4835
CALL
Dyne Therapeutics
DYN
$3.19B
| $168K | ﹤0.01% |
10,400
+8,700
| +512% | +$200K |
2023 Q4
11 quarters
|
|
4836
PUT
Bicara Therapeutics
BCAX
$671M
| $167K | ﹤0.01% |
9,000
+2,500
| +38% | +$62.6K |
2025 Q1
6 quarters
|
|
4837
PUT
Cabaletta Bio
CABA
$287M
| $167K | ﹤0.01% |
87,100
+68,900
| +379% | +$194K |
2026 Q2
1 quarter
|
|
4838
Chewy
CHWY
$9.08B
| $167K | ﹤0.01% |
9,180
-58,929
| -87% | -$1.28M |
2025 Q3
4 quarters
|
|
4839
PUT
New Oriental
EDU
$8.14B
| $166K | ﹤0.01% |
3,000
-6,500
| -68% | -$352K |
2026 Q1
2 quarters
|
|
4840
PUT
Liberty Media Corporation Series A Common Stock
FWONA
$26.6B
| $166K | ﹤0.01% |
+1,800
| New | +$163K |
2026 Q3
0 quarters
|
|
4841
Carter's
CRI
$1.24B
| $166K | ﹤0.01% |
5,311
+4,967
| +1,444% | +$178K |
2025 Q4
3 quarters
|
|
4842
PUT
York Space Systems
YSS
$907M
| $166K | ﹤0.01% |
19,200
-1,600
| -8% | -$20.8K |
2026 Q1
2 quarters
|
|
4843
Graham Corp
GHM
$1.01B
| $166K | ﹤0.01% |
1,919
-8,605
| -82% | -$846K |
2026 Q2
1 quarter
|
|
4844
PUT
Bank of Hawaii
BOH
$2.73B
| $165K | ﹤0.01% |
2,400
+900
| +60% | +$70.5K |
2022 Q4
15 quarters
|
|
4845
CALL
Liberty Live Group Series C
LLYVK
$9.9B
| $165K | ﹤0.01% |
+1,700
| New | +$174K |
2026 Q3
0 quarters
|
|
4846
PUT
OceanaGold Corp
OGC
$6.01B
| $165K | ﹤0.01% |
6,000
+5,900
| +5,900% | +$161K |
2026 Q2
1 quarter
|
|
4847
CALL
Repay Holdings
RPAY
$340M
| $165K | ﹤0.01% |
45,600
| – | – |
2026 Q2
1 quarter
|
|
4848
CALL
Akebia Therapeutics
AKBA
$138M
| $165K | ﹤0.01% |
179,400
+58,400
| +48% | +$62.8K |
2018 Q2
33 quarters
|
|
4849
Zentalis Pharmaceuticals
ZNTL
$165M
| $165K | ﹤0.01% |
59,536
-19,368
| -25% | -$78.1K |
2026 Q1
2 quarters
|
|
4850
CALL
NET Power
NPWR
$67.2M
| $165K | ﹤0.01% |
110,600
+36,600
| +49% | +$60.7K |
2023 Q4
11 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.